Answer
Praise be to Allaah.
Tayammum is done as follows: you strike the earth with your hands, then you wipe your whole face, then you wipe each arm with the other hand.
Source: I’laam al-Musaafireen bi Ba’d Aadaab wa Ahkaam al-Safar wa ma yakhuss al-Mallaaheen al-Jawwiyyeen by Shaykh Muhammad ibn Saalih al-‘Uthaymeen, p. 13
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